Implement retainer for pneumatic tools



May 20, 1930. 4 Q ALLEN 1,759,562

IMPLEMENT RETAINER FOR PNEUMATIC TOOLS Filed April 2 1928 lHlll l Mum 'i'illllll 3 i INVENTOR.

\y -2 HIS ATTORNEY.

Patented May 20, 1930 1 UNITED STATES PATENT OFFICE ROY o. LEN, 0 ATHENS, PENNSYLVANIA, A'ssIG oR TO INGERSOLL-BAND co 1vr- EANY, 0F JERSEY CITY, W J RSEY, A ooEPo A'rIoN on NEW JERSEY .IMPLEMENT.R ETAINER FOR PNEUMATIC TOOLS Application filed April 2,

This invention relates to pneumatic tools, but more particularly to implement retainers for tools of the hammer type inwhich the working implement extends into the end 5 of the cylinder to receive thebl'ows of the hammer piston.

The objects of the invention are to prevent 7 invention applied thereto,

Figure 2 is a transverse View taken through Figure 1 on the line 22 looking in the direction indicated by the arrows,

Figure 3 is a perspective view ofthe front end of a cylinder,

Figure 4 is a perspective view of the lock- 7 ing ring, and V Figure 5 is a similar view of the rearward end of the retainer sleeve. 1

Referring to the drawings, the invention is shown applied to a pneumatic tool having a cylinder A into which extends a shank B of a working implement C. The shank B is guided by a bushing, D inserted into the front end of the cylinder A and extends into the front end of the cylinder to receive the blows of a hammer piston Ereciprocable in the cylinder A. v p 1 At the juncture of the shank B and the body portion of the working implement C is a collar F which abuts the front end of the cylinder A to limit the distance which the shank B may extend into the cylinder.

In accordance with. the present invention,

means are provided for preventing the ejection of the working implement C from the cylinder A. These means comprise a sleeve G having a plurality of rows of arcuate ribs H in the rearward portion thereof to inter- 5 look with arcuate ribs J on the front end of thefront end of the sleeve "l/Vhen' used 1928. Serial No. 266,528.

the cylinder A. The ribs J are arranged in longitudinal rows about the periphery of the cylinder and the adjacent rows of ribs J are spaced so with respect to each other thatthe ribs H of the sleeve G may pass-' readily therebetween.

At a point forwardly of the innermost rib'H of the sleeve G is a-shoulde'r li which when the sleeve G is placed on the cylinder Armay abut the front end of the cylinder and thus serve to locate the ribs H with respect to and guide them into engagement with the ribs J of the cylinder. The means provided for the'working 'implement C in the cylinder A comprises in this instance a rubber buffer L which, when used for working implements having-an enlargedcutting bit, such as a drill'stee-l or a clay shovel, maybe split to enable said bufier to be readily disposedabout the body portion of the implement. "The buffer L is preferably of a size to'closely embrace'the body portion of the implement and :is seated on a bushing O disposed Within a boreP in for retaining implements "of the type in which it becomes necessary to split the bufi'er L, the bushing 0 may be formed in half sections Q, to enable them to be disposed about 'the 'bodyportion of that type-of working T39 implement. I r. l-

In order to insure against the accidental removal of the-sleeveG from the cylinder A, the cylinder is provided with a reducedgportion S rearwardly of'the ribs J. 0n this reduced portion is slidably disposed suitable locking means consisting in this instance of a ringportion T havingintegral fingers U. The number of the fingers U. mayiequal that of the rows of ribs J and H. Thesefingers mayfbe of substantially i the same width as the space between :a'dj acent rows of ribs bevstween which said fingers extendkto act as an abutment therefor. J r J In cross section the ring portion T maybe of semi-circular 'shapeso that it may; be readily. grasped by: the operators for moving it into or out of the locking position; The inner surfaces V of the fingers U maysnugly engage the rperiphry ofithe .cylindersA'and ''of the ribs J therethroughI Althoughthefingers U of the ring may be adapted to maintain the ring T .in the locking "position, other means, such as a spring Y, -may be disposed aboutthe reduced portion S of the cylinder to seat with 7 one end against the rearward end 'of the ring T and with its other end; against a shoulder Z at the rearward end of the) reduced portion I 1 In assembling the retainer on the cylinder,

. the spring Y and the ring T' may first be placed in the reduced portion of the cylinder. After the working implement C has been inserted in the cylinder, the cushioning means,

7 such as the buffer L, the bushing O and 1 the collar sections R, maybe'disposed about v theimplement C and the sleeve G may then be moved in position to embracethe cushioning means. Continued rearward movement I of the sleeve will enable the ribs H to'pass between the ends of 'the' ribs J until the shoulder K of the sleeve abuts the front end of the cylinder. If then the sleeve G is rotated a partial, revolution, the ribs H will .be moved into engagement with the ribs J.

tools, the combination of a cylinder and V a working implement extending intothe cylinder, a sleeve for retaining theFimplement in the cylinder, arcuate ribs on the cylinder and'in the sleeve adapted to interlock for holding the sleeve on' the' cylinder, a shoulder in the sleeve to-abut the end'of the cylinder for guiding the ribs 1 .into engagement with each other, a rjng slidable. on the cylinder having integral fingers to extend between the ribs for holding the sleeve against-rotation with'respect to the cylinder, aj spring seated with one end against the ring and with its other end 7 against the cylinder to maintain'the fingers 1 between the ribs, and yieldable means in the sleeve for limiting the forward movement of the working implement.

In testimony .whereof Ihave signed this specification. V p 7 ROY O. ALLEN.

Thereafter the ring T may be released and Y the spring Y will move saidrring in a for wardly direction to enter the'fingers U be- I tween the adjacent rows of interlocked ribs .J and H and will be held in this position by the spring unaffected bythe vibration of the tool. .7

V The mode of assembling may vary with the specific type of working implement used. That described is based on the assumption that a tool of the coal pick type isused. In suoh'case it is of course possible for the sleeve G to pass over the bitend of the tool. When usedwith tools in which this is not possible,

as forinstance',"a clay spade or drillsteels,

implement from the rearward end of the working implement and the other operations -wi1l':follow as described.

the sleeve G maybe placedonthe working The present invention ispa-rticularly 'de-' sirable for use in'connection with pneumat c 5 tools in which frequent changes ofthe workingj'implements; are required; As will be readily seen, theretaining device may be i quickly removed from the cylinder or placed thereon. It is of sturdy construction and '7 therefore fully'c'apable of withstanding any rough usage to 3 which 1 it may be subjected and is adapted for use in connectionwith any 7 [type of working'implement which tools of V I claim:

s type are'intended to actuate.

'In .an' implement retainer for pneumatic 

